Please, try it and report back!
I wear, when I can, heavy clothes. Favorite piece? A big overcoat from the 1930s or 1940s, fairly short in length but made of incredibly stout woolen stuff. I only clean it once a year. It seems to have the effect of a weight blanket, but, unfortunately, it's not a lot of good in summer.
A breathable weighted vest that concealed under clothing might help a lot of Aspies. You could call it "Summer-Weights." It'd have to be fairly inconspicuous, and easy to make.
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Your neurodiverse (Aspie) score: 134 of 200
Your neurotypical (non-autistic) score: 72 of 200
You are very likely neurodiverse (Aspie)